2o8 THE PILEQLATED WARd|^ER. 



No. 84. 



PILEOLATKl) VVARHII.R. 



A. ( >. L'. No. (185 a. Wilsonia pusilla pileolata (I'allas). 



Description. — .Idult male: Abovir bright ulivu green; forehead, sides of 

 head, and underparts bright greenish yellow, tinged on sides witii olive-green ; 

 crown, or "cap," Iitstroiis black; wings and tail fuscons and olive-edged withont 

 |)ecu!iar marks; bill dark alxive, light below; feel light brown. .Idult female: 

 Similar, but the black ca]) wanting, or, if present, less distinct. Immature; l.ikc 

 female witlmnt cap. Length about 4.75; wing 2.20 i 56 j ; tail 1. 97 (50) ; bill .38 

 18.5^ ; tardus .75 ( 18.8 ). 



Recognition Marks. — Least, — pygniy size; black caj) of male distinctive; 

 recognizal>lc in any i)linnagc by small size and greenish yellow coloration. 

 I'righter than /('. pusilla: not so bright as /('. />. cliryseola. 



Nesting. — .\s ne.xt. 



General Range. — Western N'orth America, breeding thruout the Kocky 

 Mountain ili^trict, north to Alaska, west to Cascade Range in Oregon and Wash- 

 ington and to X'ancouver Island; during migrations over the entire western 

 Liiite<l States, and east irregularly to the Mississipi)i ; snuth in winter over .Mexico 

 and Central .America. 



Range in Washington. — \ot common resident and abundant migrant on 

 Kast-side ; migrant only west of Cascades. 



Migrations. — Spriiii/: May 1-13. 



Authorities.— Dawson, Auk XI\ .. i8<(7. 180. ( T). (C&S;. D'. Kb. D-. J. E. 



Specimens. — 1'.. I'.X. I'.. V. 



Till'", pervading yellowness of this little Ijiisli-ranger will h.'irdly serve to 

 distinguish it from the c{|iially coninion Lutesccnt Warbler, unless you are 

 able to c.itch sight of its tiny silken crowii-])atcli of black, the "little cap" 

 which gives the bird its Latin-sounding name. With cliryseola it is the smallest 

 of our warblers, and it is one of the commonest, during migrations, on the 

 Kast-side. The thickets have taken on full leaf before the bird arrives from 

 the South, along alwut the loth of NL\v, and the northward march is often 

 prolongeil till the first of June. So exi)ert is the little Illack-caj) at threading 

 briary tangles, that a meeting here depends uiH)n the bird's caprice rather than 

 the astuteness of the observer. Willow trees are favorite stations during the 

 spring movement, and these because of their scantier foliage afford the best 

 opportunities for study. 



My im])rcssion is that the Pileolateil Warbler must breed s|)aringly in 

 eastern Washington. There is, however, r)nly one summer record to substanti- 

 ate this belief, — a bird seen in the valley of the Stehekin, June 22m\. 1906. 

 The only song I have beard differed from the abrujitly terminated crescendo 

 of W. p. cliryseola. being rather a well modulated swell, chip chip! chip'! 

 chip!!! chip"! chip'! chip! chip. 



